99. Select the net ionic equation for the reaction between sodium chloride and mercury(1) nitrate. 2NACI(aq) A) Na (aq) B) Hg"(aq) C) NaCl(aq) D) Hg2(NO3)2(aq) E) Hgz"(aq) Hg:Cl2(s) Hg2(NO3)2(aq) NO3 (aq) 2C1 (aq) Na*(aq) Hg2"(aq) → Hg2(s) NaNO3(aq) NaNO:(aq) Hg2Cl2(s) Cl (aq) 2NO3 (aq) -> -> 2+ -> -> -> 2+ 100. Consider the reaction: 3Co"(aq) + 6NO;"(aq) + 6Na*(aq) + 2PO4 (aq) → Co3(PO4)2(s) + 6Na"(aq) + 6NO3 (aq) Identify the net ionic equation for this reaction. A) Na (aq) + NO; (aq) → NaNO3(aq) B) 3C02"(aq) + NO3 (aq)+ Na*(aq) + 2PO4*(aq)→ Co3(PO4)2(s) + NaNO3(aq) C) 3C02"(aq) + 6NO3 (aq) + 6Na*(aq) + 2PO4(aq) → Co3(PO4)2(s) + 6NANO3(aq) D) 3C02"(aq) + 2PO4* (aq) → Co3(PO4)2(s) E) None of the above is the correct net ionic equation. 101. Copper(II) sulfide, CuS, is used in the development of aniline black dye in textile printing. What is the maximum mass of CuS which can be formed when 38.0 mL of 0.500 M CuC12 are mixed with 42.0 mL of 0.600 M (NH4)2S? Aqueous ammonium chloride is the other product. A) 2.41 g E) 0.044 g D) 0.909 g C) 1.21 g B) 1.82 g 102. An acid A) produces hydroxide ions when dissolved in water. Base B) changes the color of phenolphthalein indicator from colorless to pink. C) donates electrons in an electron transfer reaction. donates protons in a proton transfer reaction. E) does none of the above. 103. A base A) causes phenolphthalein indicator to change from colorless to pink. aud B) donates a proton in a proton transfer reaction. C) accepts electrons in an electron transfer reaction. D) produces hydrogen ions in solution. acids E) does none of the above. 50
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
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